AMBE-1000 Digital Voice Systems, Inc., AMBE-1000 Datasheet - Page 46

• Manufacturer Part Number: AMBE-1000
• Manufacturer: Digital Voice Systems, Inc.

4.2.2
The AMBE-1000 is not recommended for new designs.
2 bits per Word Format
3 bits per Word Format
4 bits per Word Format
1 bit per Word Format
Please refer to the AMBE-2000/2020 product line.
See Table 3-A
Bits per Word
Unframed Serial Input Format
The Unframed Input format contains 1 to 4 bits within each 16 bits serial output word.
For the formats which contain more than one bit each word the MSB of the data bits is
considered first in the transmission. In Unframed mode, the header data from Framed
mode is dropped and each 16 bit write contains 1 to 4 coded voice data bits.
number of words that need to be transferred into the decoder for each 20 millisecond
frame will be the number of bits per frame divided by the number of bits per word. So
a system coding at 4800 bps with 3 bits per word will need to write exactly 32 ( [4800
described in the next section.
As long as the first three bits of the Control Offset field are zero the remaining bits are
ignored. As you will see in the next section, using Control Offset values of 0x2-0xf will
input the Control Data field information to the decoder to be used as Control Frame
information.
Table 4-Z Unframed Serial Input Data Format
50]
3 = 32) words each frame.
The AMBE-1000 is not recommended for new designs.
Please refer to the AMBE-2000/2020 product line.
D
D
D
D
15
msb
msb
msb
msb
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Data
14
D
D
D
0
13
D
D
0
0
page 46
12
D
0
0
0
11
0
0
0
0
The procedure for inputting control frames is
Control Offset
10
0
0
0
0
9
0
0
0
0
X
X
X
X
8
X
X
X
X
7
X
X
X
X
6
X
X
X
X
5
Control Data
X
X
X
X
4
X
X
X
X
3
X
X
X
X
2
The
X
X
X
X
1
X
X
X
X
0